<template>
  <div class="add-role">
    <main class="add-main">
      <div class="step-container">
        <el-steps direction="vertical" :active="activeStep">
          <el-step title="角色信息" />
          <el-step title="权限信息" />
          <el-step title="检查并完成" />
        </el-steps>
      </div>
      <div v-show="activeStep === 1" class="form-container">
        <div class="title">角色信息</div>
        <div class="form">
          <el-form ref="roleForm" class="form-box" :model="roleForm" :rules="roleRules">
            <el-form-item label="角色名称" prop="roleName">
              <el-input v-model="roleForm.roleName" />
            </el-form-item>
            <el-form-item label="角色描述">
              <el-input v-model="roleForm.remark" />
            </el-form-item>
          </el-form>
        </div>
      </div>
      <div v-show="activeStep === 2" class="form-container">
        <div class="title">权限配置</div>
        <div class="form">
          <template>
            <div class="tree-wrapper">
              <div v-for="item in treeList" :key="item.id" class="tree-item">
                <!-- title -->
                <div class="tree-title">{{ item.title }}</div>
                <!-- 树形结构 -->
                <el-tree
                  ref="tree"
                  :props="{label:'title'}"
                  :data="item.children"
                  show-checkbox
                  :default-expand-all="true"
                  node-key="id"
                  highlight-current
                />
              </div>
            </div>
          </template>
        </div>
      </div>
      <div v-show="activeStep === 3" class="form-container">
        <div class="title">检查并完成</div>
        <div class="form">
          <div class="info">
            <div class="form-item">角色名称：{{ roleForm.roleName }}</div>
            <div class="form-item">角色描述：{{ roleForm.remark }}</div>
            <div class="form-item">角色权限：</div>
            <div class="tree-wrapper">
              <template>
                <div v-for="item in disableTreeList" :key="item.id" class="tree-item">
                  <div class="tree-title">{{ item.title }}</div>
                  <el-tree
                    ref="disableTreeList"
                    :data="item.children"
                    show-checkbox
                    default-expand-all
                    node-key="id"
                    :highlight-current="false"
                    :props="{ label: 'title'}"
                  />
                </div>
              </template>
            </div>
          </div>
        </div>
      </div>
    </main>
    <footer class="add-footer">
      <div class="btn-container">
        <el-button v-if="activeStep > 1" @click="decreseStep">上一步</el-button>
        <el-button v-if="activeStep < 3" type="primary" @click="nextStep">下一步</el-button>
        <el-button v-if="activeStep === 3" type="primary" @click="confirmAdd">{{ roleId ? '确认修改' :'确认添加' }}</el-button>
      </div>
    </footer>
  </div>
</template>
<script>
import { createRoleUserAPI, getRoleDetailAPI, getTreeListAPI, updateRoleAPI } from '@/api/system'
import { addDisabled } from '@/utils'

export default {
  data() {
    return {
      activeStep: 1,
      treeList: [],
      disableTreeList: [],
      roleForm: {
        roleName: '',
        remark: ''
      },
      roleRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ]
      }
    }
  },
  computed: {
    roleId() {
      return this.$route.query.id
    }
  },
  mounted() {
    this.getTreeList()
    if (this.$route.query.id) {
      this.getRoleDetail()
    }
  },
  methods: {
    // 获取树形数据列表
    async getTreeList() {
      const res = await getTreeListAPI()
      // console.log(res)
      this.treeList = res.data
      this.disableTreeList = JSON.parse(JSON.stringify(res.data))
      addDisabled(this.disableTreeList)
    },
    async getRoleDetail() {
      const res = await getRoleDetailAPI(this.roleId)
      const { perms, remark, roleId, roleName } = res.data
      // 回填基础信息
      this.roleForm = { perms, remark, roleId, roleName }
      // 回填权限信息
      this.$refs.tree.forEach((tree, index) => {
        tree.setCheckedKeys(this.roleForm.perms[index])
      })
    },
    decreseStep() {
      if (this.activeStep === 1) return
      this.activeStep--
    },
    // 下一步
    nextStep() {
      if (this.activeStep === 3) return
      if (this.activeStep === 1) {
        // 当前是角色信息状态，进行表单校验
        this.$refs.roleForm.validate(valid => {
          if (valid) {
            // 校验通过才能进入下一个状态
            this.activeStep++
          }
        })
        // 当前是角色信息状态
      } else if (this.activeStep === 2) {
        // 当前是权限信息状态
        this.roleForm.perms = []
        this.$refs.tree.forEach(tree => {
          this.roleForm.perms.push(tree.getCheckedKeys())
        })

        // 如果长度为零 没有选中任何东西
        if (this.roleForm.perms.flat().length === 0) {
          this.$message({
            type: 'error',
            message: '请至少选择一个权限点'
          })
        } else {
          // 如果长度不为零，进入到检查并完成
          this.activeStep++
          // 回填已选择数据
          this.$refs.disableTreeList.forEach((tree, index) => {
            tree.setCheckedKeys(this.roleForm.perms[index])
          })
        }
      }
    },
    async confirmAdd() {
      // 编辑
      if (this.roleId) {
        await updateRoleAPI(this.roleForm)
      } else {
        // 添加
        await createRoleUserAPI(
          this.roleForm
        )
      }
      this.$message({
        type: 'success',
        message: `${this.roleId ? '编辑' : '新增'}角色成功`
      })
      this.$router.back()
    }
  }
}
</script>
    <style scoped lang="scss">
    .add-role {
      background-color: #f4f6f8;
      height: 100vh;

      .add-header {
        display: flex;
        justify-content: space-between;
        padding: 0 20px;
        height: 64px;
        line-height: 64px;
        font-size: 16px;
        font-weight: bold;
        background-color: #fff;

        .left {
          span {
            margin-right: 4px;
          }

          .arrow {
            cursor: pointer;
          }
        }

        .right {
          text-align: right;
        }
      }

      .add-main {
        position: fixed;
        top: 64px;
        bottom: 88px;
        width: 100%;
        overflow-y: auto;
        background: #f4f6f8;
        padding: 20px 230px;
        display: flex;
        .step-container {
          height: 400px;
          width: 200px;
        }
        .form-container {
          flex:1;
          background-color: #fff;
          overflow-y: auto;
          .title {
            height: 60px;
            line-height: 60px;
            padding-left: 20px;
          }
          .form {
            margin-bottom: 20px;
            padding: 20px 65px 24px;
            .el-form {
              display: flex;
              flex-wrap: wrap;
            }
            .info{
              font-size:14px;
              color:#666;
              .form-item{
                margin-bottom:20px;
              }
            }
          }
          .form-box{
            width: 600px;
            display: flex;
            flex-direction: column;
          }
        }
      }

      .add-footer {
        position: fixed;
        bottom: 0;
        width: 100%;
        padding: 24px 50px;
        color: #000000d9;
        font-size: 14px;
        background: #fff;
        text-align: center;
        z-index: 10001;
      }
      .tree-wrapper {
          display: flex;
          justify-content: space-between;
          flex-wrap: wrap;
          .tree-item {
            flex: 1;
            padding: 0px 4px;
            text-align: center;
            .tree-title {
              background: #f5f7fa;
              text-align: center;
              padding: 10px 0;
              margin-bottom: 12px;
            }
          }
        }
    }
    </style>
